Atomic Theorists How we got to where we are now. Law of Conservation of Mass Matter can’t be created or destroyed Who: Antoine Lavoisier When: 1785 Where:

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Presentation transcript:

Atomic Theorists How we got to where we are now

Law of Conservation of Mass Matter can’t be created or destroyed Who: Antoine Lavoisier When: 1785 Where: France

Law of Definite Proportions Compounds = Elements put together in fixed whole number ratios C + O 2  CO 2 Who: Joseph Proust When: 1797 Where: France

Law of Multiple Proportions Two elements can form more than one compoundelements compound The ratios of elements will be small whole numbers. Who: John Dalton Where: EnglandWhen: 1803

What: All matter is a combo of fire, air, earth or water When: 350 B.C. Where: Greece Who: Aristotle

Who: Democritus When: 400 B.C. Where: Greece What: Matter was made of indivisible substances he called atomos (1 st talk of the atom)

What: Solid Sphere Model (1 st atomic theory) Matter is made up of indivisible particles All atoms of a particular element are identical Different elements are composed of different kinds of atoms. Compounds are composed of atoms in specific ratios. Atoms are not created or destroyed in a reaction. When: 1805Where: England Who: John Dalton

How did Dalton do ? Matter is made up of indivisible particles No. Atoms can be divided All atoms of a particular element are identical No. Doesn’t account for isotopes Different elements are composed of different kinds of atoms. Yes! Compounds are composed of atoms in specific ratios. Yes! Atoms are not created or destroyed in a reaction. Yes!

What: Atoms aren't smallest particle Conducted experiment with a Cathode Ray Tube Particles had a negative charge (discovered electrons) Model = plum pudding When: 1897 Where: England Who: J.J. Thomson

Cathode Ray Tube

What: Experiments to determine mass of electron Conducted the oil drop experiment Verified that electron is negatively charged No new model Where: AmericaWhen: 1910 Who: Robert Millikan

Millikan Oil Drop Experiment

Who: Ernest Rutherford What: Conducted Gold Foil experiment Proved nucleus is dense, positively charged core of atom When: 1911 Where: America Model = Planetary Model

Rutherford’s Experiment Gold Foil Experiment

Who: Niels Bohr What: Pulsating Planetary Model Electrons can move between energy levels When: 1913 Where: Denmark

Who: James Chadwick What: Confirmed existence of neutron No new atomic model When: 1932 Where: England

Whose model of the atom is represented by this diagram? 1.Aristotle 2.Democritus 3.Dalton 4.Thomson 5.Millikan 6.Rutherford 7.Bohr 8.Chadwick

Whose model of the atom is represented by this diagram? 1.Aristotle 2.Democritus 3.Dalton 4.Thomson 5.Millikan 6.Rutherford 7.Bohr 8.Chadwick

Whose model of the atom is represented by this diagram? 1.Aristotle 2.Democritus 3.Dalton 4.Thomson 5.Millikan 6.Rutherford 7.Bohr 8.Chadwick

Whose model of the atom is represented by this diagram? 1.Aristotle 2.Democritus 3.Dalton 4.Thomson 5.Millikan 6.Rutherford 7.Bohr 8.Chadwick

Whose model of the atom is represented by this diagram? 1.Aristotle 2.Democritus 3.Dalton 4.Thomson 5.Millikan 6.Rutherford 7.Bohr 8.Chadwick

Whose model of the atom is represented by this diagram? 1.Aristotle 2.Democritus 3.Dalton 4.Thomson 5.Millikan 6.Rutherford 7.Bohr 8.Chadwick

Whose model of the atom has the name “Planetary Model”? 1.Aristotle 2.Democritus 3.Dalton 4.Thomson 5.Millikan 6.Rutherford 7.Bohr 8.Chadwick

Whose model of the atom has the name “Solid Sphere”? 1.Aristotle 2.Democritus 3.Dalton 4.Thomson 5.Millikan 6.Rutherford 7.Bohr 8.Chadwick

Whose model of the atom has the name “Pulsating Planetary Model”? 1.Aristotle 2.Democritus 3.Dalton 4.Thomson 5.Millikan 6.Rutherford 7.Bohr 8.Chadwick

Whose model of the atom has the name “Plum Pudding”? 1.Aristotle 2.Democritus 3.Dalton 4.Thomson 5.Millikan 6.Rutherford 7.Bohr 8.Chadwick